Sometimes if the Solar Plows are delayed after a storm and the warm weather heats the snow, the next morning can produce local ice-skating opportunities. Locals learn to approach stop signs slowly to keep their vehicles from skating through an intersection. :-)
The two small rinks will close soon, CU does have open skates, call for schedule. Most of the time is alloted to hockey but reasonable amounts of free skate time. Ice is perfect and big compared to small rinks. Also Ice at ymca at 95th and arapahoe, same deal some open skate times.